The HDMI inputs are pass through inputs only. The reciever cannot recieve any sound signals through the HDMI's. The reciever acts as a selector switch for the HDMI inputs. Whatever input you have selected on the reciever is the one that is being sent through the output to your
TV. The "unlock" display shows when there is no sound signal sent to the reciever. There is no code to unlock. This is the reciever's way of telling you that there is no sound being sent to it from that input. Since there is no sound being processed from the HDMI's, you need to hook up an additional
audio cable from the device to the reciever (preferrably an optical cable). When the reciever recieves an audio signal, it will then "unlock" and you will get sound. The only purpose for the HDMI jacks on this reciever is to give you a bonus HDMI jack so you only have to use one on your TV. I know it is confusing. I had to look into this problem myself, so I'm happy to help. Higher end recievers will actually recieve and process sound signals from the HDMI's.
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